EP1017944A1 - Compound pump - Google Patents

Compound pump

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Publication number
EP1017944A1
EP1017944A1 EP98954252A EP98954252A EP1017944A1 EP 1017944 A1 EP1017944 A1 EP 1017944A1 EP 98954252 A EP98954252 A EP 98954252A EP 98954252 A EP98954252 A EP 98954252A EP 1017944 A1 EP1017944 A1 EP 1017944A1
Authority
EP
European Patent Office
Prior art keywords
pump
stage
friction
threaded
webs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98954252A
Other languages
German (de)
French (fr)
Other versions
EP1017944B1 (en
Inventor
Günter Schütz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leybold GmbH
Original Assignee
Leybold Vakuum GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leybold Vakuum GmbH filed Critical Leybold Vakuum GmbH
Publication of EP1017944A1 publication Critical patent/EP1017944A1/en
Application granted granted Critical
Publication of EP1017944B1 publication Critical patent/EP1017944B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/168—Pumps specially adapted to produce a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F04D19/046—Combinations of two or more different types of pumps

Definitions

  • the invention relates to a friction vacuum pump with at least one turbomolecular pump stage, a threaded pump stage adjoining it on the pressure side and a filling stage located between the turbomolecular pump stage and the threaded pump stage.
  • turbomolecular pumps with downstream thread stages also called compound pumps
  • the pumped gas must be transferred from a pumping chamber with a relatively large volume in which the axial compressor stages are located to a pumping chamber (pumping gap) with a relatively small volume in which the thread is located.
  • Known designs of this transition area have the disadvantage that flow stalls occur. These significantly affect the pumping speed of the pump.
  • the object of the present invention is to substantially simplify the design of the full level. chen, without having to give up a effekive feeding the thread ⁇ pumping stage.
  • this output is achieved in that the filling stage is designed as a centrifugal stage.
  • Components of the centrifugal stage are rotating webs, which are located at the level of the suction-side area of the thread pump stage.
  • the effect of the centrifugal pump is that the gases emerging from the turbomolecular pump stage are deflected, compressed and fed to the delivery chamber of the threaded pump. The gas flow is largely continuous, so that the disruptive stalls no longer occur.
  • stator of the turbomolecular pump consists in a manner known per se, of spacer rings and vane halves, without removing the rotor from the stator of both pump stages assemble or disassemble the turbomolecular pump stage.
  • FIGS. 1 to 6 Show it Figure 1 shows a partial longitudinal section through an embodiment example of a friction vacuum pump according to the invention and
  • FIGS 2 to 5 plan views of different variants for the centrifugal stage.
  • the pump itself is denoted by 1, its inlet by 2 and its outlet by 3.
  • the housing of the pump 1 comprises the two sections 4 and 5.
  • the housing section 4 surrounds the stator 6 and the rotor 7 of the turbomolecular pump stage.
  • the stator ⁇ comprises the blade half rings 8, which are only indicated schematically, and the spacer rings 9, which together form a self-centering stator package.
  • the rotor 7 is equipped with the rotor blades 10.
  • the housing section 4 likewise surrounds the stator 11 and the rotor 12 of the threaded pump stage, the delivery space or delivery gap of which is designated by 13.
  • the thread 14 of this stage can be arranged on the stator or rotor side. In the exemplary embodiment shown, it is arranged on the stator side and is part of a stator sleeve 15 which can be mounted independently of the housing section.
  • the rotor 7 of the turbomolecular pump stage 7, 8 and the rotor 12 of the threaded pump stage 11, 12 are components of a jointly rotating system 7, 12.
  • the rotor 12 of the threaded pump stage 11, 12 forms the pressure-side end of this system and can be designed as a disk or bell-shaped (as shown in FIG. 1).
  • the housing section 5 surrounds the drive motor 16, the stator of which is designated 17 and the rotor of which is designated 18.
  • the housing section 5 is part of a Chassis 19 with an interior in which the drive motor 16 and other components are located.
  • the shaft 21, which carries the rotors 7 and 12 of the compound pump, is also mounted in the chassis 19. Only the upper bearing 22 is visible. Otherwise, the chassis 19 is the carrier of all other components of the pump 1.
  • stator sleeve 15 is supported on the chassis 19.
  • the inside diameter is somewhat larger than the outside diameter of the rotor 7 of the turbomolecular pump stage, so that the stator sleeve 15 can be removed, with the housing section 4 removed and the stator 6 of the turbomolecular pump stage 6, 7 removed. This makes it possible to mount all stator components 8, 9, 15 only after assembly and also after balancing of the rotating system 7, 12.
  • a ring 23 lies on the suction-side end face of the stator sleeve 15, the inner edge of which corresponds to the inner diameter of the spacer rings 2.
  • the stator pack 6 is supported on the ring 23.
  • a filling stage which is designed as a centrifugal stage 24, is located between the turbomolecular pump stage 6, 7 and the threaded pump stage 11, 12. It comprises webs 25 which extend essentially radially outwards and form pockets 26 facing the last row of rotor blades. Different embodiments of the centrifugal stage 24 are shown in FIGS. 2 to 5. Between the webs 25 there are the pockets 26, which are open at the top and outside. The arrow 27 indicates the direction of rotation.
  • the centrifugal stage 24 is part of the rotor 12 of the thread pump. pen level. It is formed on the side of the disk-shaped or bell-shaped rotor 12 facing the blades 10 of the turbomolecular pump stage 7, 10.
  • the depth of the pockets 26 can increase radially outwards (Fig.l). Their position is chosen so that the peripheral openings of the pockets 26 are at the level of the entry of the thread pump stage 11, 12.
  • the webs in the embodiment according to FIG. 2 extend radially.
  • the webs 25 in the embodiments according to the figures 3 and 4 are inclined to the rear in relation to the direction of rotation 27, in the embodiment according to FIG. 5 to the front.
  • the exit angle of the webs determines the static and the dynamic part of the pressure level. If the web is curved backwards, there is a high static component.
  • the degree of deflection in the circumferential direction is reinforced by a backward curvature. If the web is curved forward, there is a high dynamic share.
  • FIG. 1 also shows that the radial dimensions of the pockets 26 essentially correspond to the pump-active length of the blades 10 of the last row of rotor blades located on the pressure side.
  • the gases leaving the turbomolecular pump stage are deflected as a result of the action of the webs 26 and pockets 27, specifically in the direction of the delivery gap 13 of the threaded pump stage 11, 12.
  • compression takes place so that flow interruptions are largely avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
  • Steroid Compounds (AREA)

Abstract

The invention relates to a friction vacuum pump (1) containing at least one turbomolecular pump step (6, 7), a screw pump step (11, 12) connected to the delivery side of the pump, and a filling step (24) arranged between the turbomolecular pump step (6, 7) and the screw pump step (11, 12). According to the invention, said filling step (24) is configured as a centrifugal step in order to simplify the construction thereof.

Description

CompoundpumpeCompound pump
Die Erfindung bezieht sich auf eine Reibungsvakuumpumpe mit mindestens einer Turbomolekularpumpenstufe, einer sich daran druckseitig anschließenden Gewindepumpenstu- fe sowie einer zwischen der Turbomolekularpumpenstufe und der Gewindepumpenstufe befindlichen Füllstufe.The invention relates to a friction vacuum pump with at least one turbomolecular pump stage, a threaded pump stage adjoining it on the pressure side and a filling stage located between the turbomolecular pump stage and the threaded pump stage.
Bei Turbomolekularpumpen mit nachgeschalteten Gewindestufen, auch Compoundpumpen genannt, muß das geförderte Gas aus einem Förderraum mit relativ großem Volumen, in dem sich die Axialverdichterstufen befinden, in einen Förderraum (Förderspalt ) mit relativ kleinem Volumen, in dem sich das Gewinde befindet, überführt werden. Bekannte Gestaltungen dieses Übergangsbereichs haben den Nachteil, daß es zu Strömungsabrissen kommt. Diese beeinträchtigen in erheblichem Maße das Saugvermögen der Pumpe .In turbomolecular pumps with downstream thread stages, also called compound pumps, the pumped gas must be transferred from a pumping chamber with a relatively large volume in which the axial compressor stages are located to a pumping chamber (pumping gap) with a relatively small volume in which the thread is located. Known designs of this transition area have the disadvantage that flow stalls occur. These significantly affect the pumping speed of the pump.
Aus der DE-A-196 32 874 ist bekannt, zwischen der Turbomolekularpumpenstufe und der sich daran anschließenden Gewindepumpenstufe eine Füllstufe vorzusehen, die mit Flügeln ausgerüstet ist. Die Herstellung einer Zwischenstufe dieser Art ist aufwendig. Außerdem erschweren die Flügel der Zwischenstufe die Montage.From DE-A-196 32 874 it is known to provide a filling stage, which is equipped with vanes, between the turbomolecular pump stage and the subsequent threaded pump stage. The production of an intermediate stage of this type is complex. In addition, the wings of the intermediate stage make assembly difficult.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Ausbildung der Fullstufe wesentlich zu vereinfa- chen, ohne auf eine effekive Beschickung der Gewinde¬ pumpenstufe verzichten zu müssen.The object of the present invention is to substantially simplify the design of the full level. chen, without having to give up a effekive feeding the thread ¬ pumping stage.
Erfindungsgemäß wird diese Ausgabe dadurch gelöst, daß die Füllstufe als Zentrifugalstufe ausgebildet ist. Bestandteile der Zentrifugalstufe sind rotierende Stege, die sich in Höhe des saugseitigen Bereichs der Gewindepumpenstufe befinden. Die Zentrifugalpumpe hat die Wirkung, daß die aus der Turbomolekularpumpenstufe austretenden Gase umgelenkt, verdichtet und dem Förderraum der Gewindepumpe zugeführt werden. Der Gasstrom ist weitgehend kontinuierlich, so daß es nicht mehr zu den störenden Strömungsabrissen kommt.According to the invention, this output is achieved in that the filling stage is designed as a centrifugal stage. Components of the centrifugal stage are rotating webs, which are located at the level of the suction-side area of the thread pump stage. The effect of the centrifugal pump is that the gases emerging from the turbomolecular pump stage are deflected, compressed and fed to the delivery chamber of the threaded pump. The gas flow is largely continuous, so that the disruptive stalls no longer occur.
Dadurch, daß die Zentrifugalstufe eine U lenkung der Gasströmung nach außen bewirkt, besteht die Möglichkeit, für den Förderspalt der Gewindepumpenstufe einen relativ großen Durchmesser zu wählen, so daß die rotierende Pumpfläche der Gewindepumpenstufe eine hohe Umfangsgeschwindigkeit hat.Characterized in that the centrifugal stage causes U to direct the gas flow to the outside, there is the possibility of choosing a relatively large diameter for the delivery gap of the threaded pump stage, so that the rotating pump surface of the threaded pump stage has a high peripheral speed.
Ist der Innendurchmesser des außenliegenden Stators der Gewindepumpenstufe größer als der Außendurchmesser des Rotors der Turbomolekularpumpenstufe, dann besteht unter der Voraussetzung, daß der Stator der Turbomolekularpumpe in an sich bekannter Weise aus Distanzringen und Schaufelhalbringen besteht, die Möglichkeit, den Stator beider Pumpenstufen ohne Demontage des Rotors der Turbomolekularpumpenstufe zu montieren bzw. demontieren. Diese Abmessungen erlauben es, das rotierende System der erfindungsgemäßen Compoundpumpe zu wuchten und dann erst die Statorbauteile zu montieren.If the inside diameter of the external stator of the threaded pump stage is larger than the outside diameter of the rotor of the turbomolecular pump stage, then it is possible, provided that the stator of the turbomolecular pump consists in a manner known per se, of spacer rings and vane halves, without removing the rotor from the stator of both pump stages assemble or disassemble the turbomolecular pump stage. These dimensions make it possible to balance the rotating system of the compound pump according to the invention and only then to mount the stator components.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 bis 6 dargestellten Ausfüh- rungsbeispielen erläutert werden. Es zeigen Figur 1 einen Teillängsschnitt durch ein Ausführungs beispiel für eine Reibungsvakuumpumpe nach der Erfindung undFurther advantages and details of the invention are to be explained with reference to exemplary embodiments shown in FIGS. 1 to 6. Show it Figure 1 shows a partial longitudinal section through an embodiment example of a friction vacuum pump according to the invention and
Figuren 2 bis 5 Draufsichten auf verschiedene Varianten für die Zentrifugalstufe.Figures 2 to 5 plan views of different variants for the centrifugal stage.
Beim Ausführungsbeispiel nach Figur 1 sind die Pumpe selbst mit 1, ihr Einlaß mit 2 und ihr Auslaß mit 3 bezeichnet. Das Gehäuse der Pumpe 1 umfaßt die beiden Abschnitte 4 und 5.In the exemplary embodiment according to FIG. 1, the pump itself is denoted by 1, its inlet by 2 and its outlet by 3. The housing of the pump 1 comprises the two sections 4 and 5.
Der Gehäuseabschnitt 4 umgibt den Stator 6 und den Rotor 7 der Turbomolekularpumpenstufe. Der Stator β umfaßt die nur schematisch angedeuteten Schaufelhalbringe 8 sowie die Distanzringe 9, die zusammen ein sich selbst zentrierendes Statorpaket bilden. Der Rotor 7 ist mit den Rotorschaufein 10 ausgerüstet.The housing section 4 surrounds the stator 6 and the rotor 7 of the turbomolecular pump stage. The stator β comprises the blade half rings 8, which are only indicated schematically, and the spacer rings 9, which together form a self-centering stator package. The rotor 7 is equipped with the rotor blades 10.
Der Gehäuseabschnitt 4 umgibt ebenfalls den Stator 11 und den Rotor 12 der Gewindepumpenstufe, deren Förderraum bzw. Förderspalt mit 13 bezeichnet ist. Das Gewinde 14 dieser Stufe kann stator- oder rotorseitig angeordnet sein. Beim dargestellten Ausführungsbeispiel ist es statorseitig angeordnet und Bestandteil einer unabhängig vom Gehäuseabschnitt montierbaren Statorhülse 15. Der Rotor 7 der Turbomolekularpumpenstufe 7,8 und der Rotor 12 der Gewindepumpenstufe 11,12 sind Bestandteile eines gemeinsam rotierenden Systems 7,12. Der Rotor 12 der Gewindepumpenstufe 11,12 bildet das druckseitige Ende dieses Systems und kann als Scheibe oder glockenförmig (wie in Figur 1 dargestellt) ausgebildet sein .The housing section 4 likewise surrounds the stator 11 and the rotor 12 of the threaded pump stage, the delivery space or delivery gap of which is designated by 13. The thread 14 of this stage can be arranged on the stator or rotor side. In the exemplary embodiment shown, it is arranged on the stator side and is part of a stator sleeve 15 which can be mounted independently of the housing section. The rotor 7 of the turbomolecular pump stage 7, 8 and the rotor 12 of the threaded pump stage 11, 12 are components of a jointly rotating system 7, 12. The rotor 12 of the threaded pump stage 11, 12 forms the pressure-side end of this system and can be designed as a disk or bell-shaped (as shown in FIG. 1).
Der Gehäuseabschnitt 5 umgibt den Antriebsmotor 16, dessen Stator mit 17 und dessen Rotor mit 18 bezeichnet sind. Der Gehäuseabschnitt 5 ist Bestandteil eines Chassis 19 mit einem Innenraum, in dem sich der Antriebsmotor 16 und weitere Bauteile befinden. Im Chassis 19 ist auch die die Rotoren 7 und 12 der Compound- pumpe tragende Welle 21 gelagert. Nur das obere Lager 22 ist sichtbar. Im übrigen ist das Chassis 19 Träger aller weiteren Bauteile der Pumpe 1.The housing section 5 surrounds the drive motor 16, the stator of which is designated 17 and the rotor of which is designated 18. The housing section 5 is part of a Chassis 19 with an interior in which the drive motor 16 and other components are located. The shaft 21, which carries the rotors 7 and 12 of the compound pump, is also mounted in the chassis 19. Only the upper bearing 22 is visible. Otherwise, the chassis 19 is the carrier of all other components of the pump 1.
Im montierten Zustand der Pumpe 1 sind die Gehäuseabschnitte miteinander verbunden. Die Statorhülse 15 stützt sich auf dem Chassis 19 ab. Der Innendurchmesser ist etwas größer als der Außendurchmesser des Rotors 7 der Turbemolekularpumpenstufe, damit die Statorhülse 15 - bei entferntem Gehäuseabschnitt 4 und demoniertem Stator 6 der Turbomolekularpumpenstufe 6,7 - demontierbar ist. Dadurch besteht die Möglichkeit, sämtliche Statorbauteile 8,9,15 erst nach der Montage und auch nach dem Wuchten des rotierenden Systems 7,12 zu montieren.In the assembled state of the pump 1, the housing sections are connected to one another. The stator sleeve 15 is supported on the chassis 19. The inside diameter is somewhat larger than the outside diameter of the rotor 7 of the turbomolecular pump stage, so that the stator sleeve 15 can be removed, with the housing section 4 removed and the stator 6 of the turbomolecular pump stage 6, 7 removed. This makes it possible to mount all stator components 8, 9, 15 only after assembly and also after balancing of the rotating system 7, 12.
Der saugseitigen Stirnseite der Statorhülse 15 liegt ein Ring 23 auf, dessen Innenrand dem Innendurchmesser der Distanzringe 2 entspricht. Im monierten Zustand der Pumpe stützt sich das Statorpaket 6 auf dem Ring 23 ab.A ring 23 lies on the suction-side end face of the stator sleeve 15, the inner edge of which corresponds to the inner diameter of the spacer rings 2. In the assembled state of the pump, the stator pack 6 is supported on the ring 23.
Zwischen der Turbomolekularpumpenstufe 6,7 und der Gewindepumpenstufe 11,12 befindet sich eine Füllstufe, die als Zentrifugalstufe 24 ausgebildet ist. Sie umfaßt sich im wesentlichen radial nach außen erstreckende Stege 25, die der letzten Rotorschaufelreihe zugewandte Taschen 26 bilden. Verschiedene Ausführungsformen der Zentrifugalstufe 24 sind in den Figuren 2 bis 5 dargestellt. Zwischen den Stegen 25 befinden sich die Taschen 26, die nach oben und nach außen offen sind. Der Pfeil 27 gibt jeweils die Drehrichtung an.A filling stage, which is designed as a centrifugal stage 24, is located between the turbomolecular pump stage 6, 7 and the threaded pump stage 11, 12. It comprises webs 25 which extend essentially radially outwards and form pockets 26 facing the last row of rotor blades. Different embodiments of the centrifugal stage 24 are shown in FIGS. 2 to 5. Between the webs 25 there are the pockets 26, which are open at the top and outside. The arrow 27 indicates the direction of rotation.
Beim dargestellten Ausführungsbeispiel ist die Zentrifugalstufe 24 Bestandteil des Rotors 12 der Gewindepum- penstufe. Sie ist auf der den Schaufeln 10 der Turbomolekularpumpenstufe 7,10 zugewandten Seite des scheiben- oder glockenförmig ausgebildeten Rotors 12 ausgebildet.In the illustrated embodiment, the centrifugal stage 24 is part of the rotor 12 of the thread pump. pen level. It is formed on the side of the disk-shaped or bell-shaped rotor 12 facing the blades 10 of the turbomolecular pump stage 7, 10.
Die Tiefe der Taschen 26 kann radial nach außen zunehmen (Fig.l). Ihre Lage ist so gewählt, daß sich die pe- ripheren Öffnungen der Taschen 26 in Höhe des Eintritts der Gewindepumpenstufe 11,12 befinden. Die Stege bei der Ausführungsform nach Figur 2 erstrecken sich radial. Die Stege 25 bei den Ausführungsformen nach den Firguren 3 und 4 sind in Bezug auf die Drehrichtung 27 nach hinten geneigt, bei der Ausführung nach Figur 5 nach vorne. Der Austrittswinkel der Stege (Schaufel der Zentrifugalstufe) bestimmt den statischen und den dynamischen Anteil der Druckhöhe. Ist der Steg rückwärts gekrümmt, ergibt sich ein hoher statischer Anteil. Außerdem wird der Umlenkungsgrad in Umfangsrichtung durch eine Rückwärtskrümmung verstärkt. Ist der Steg vorwärtsgekrümmt, ergibt sich ein hoher dynamischer Anteil .The depth of the pockets 26 can increase radially outwards (Fig.l). Their position is chosen so that the peripheral openings of the pockets 26 are at the level of the entry of the thread pump stage 11, 12. The webs in the embodiment according to FIG. 2 extend radially. The webs 25 in the embodiments according to the figures 3 and 4 are inclined to the rear in relation to the direction of rotation 27, in the embodiment according to FIG. 5 to the front. The exit angle of the webs (blade of the centrifugal stage) determines the static and the dynamic part of the pressure level. If the web is curved backwards, there is a high static component. In addition, the degree of deflection in the circumferential direction is reinforced by a backward curvature. If the web is curved forward, there is a high dynamic share.
Figur 1 läßt noch erkennen, daß die radialen Abmessungen der Taschen 26 im wesentlichen der pumpaktiven Länge der Schaufeln 10 der letzten druckseitig gelegenen Rotorschaufelreihe entspricht. In der Zentrifugalstufe 24 werden die die Turbomolekularpumpenstufe verlassenden Gase infolge der Wirkung der Stege 26 und Taschen 27 umgelenkt, und zwar in Richtung des Förderspaltes 13 der Gewindepumpenstufe 11,12. Gleichzeitig findet eine Verdichtung statt, so daß Strömungsabrisse weitestge- hend vermieden sind. FIG. 1 also shows that the radial dimensions of the pockets 26 essentially correspond to the pump-active length of the blades 10 of the last row of rotor blades located on the pressure side. In the centrifugal stage 24, the gases leaving the turbomolecular pump stage are deflected as a result of the action of the webs 26 and pockets 27, specifically in the direction of the delivery gap 13 of the threaded pump stage 11, 12. At the same time, compression takes place so that flow interruptions are largely avoided.

Claims

ReibungsVakuumpumpeANSPRÜCHE Friction vacuum pump CLAIMS
1. Reibungsvakuumpumpe (1) mit mindestens einer Turbomolekularpumpenstufe (6,7), mit einer sich daran druckseitig anschließenden Gewindepumpenstufe1. Friction vacuum pump (1) with at least one turbomolecular pump stage (6,7), with a threaded pump stage adjoining it on the pressure side
(11,12) und mit einer zwischen Turbomolekularpumpenstufe (6,7) und Gewindepumpenstufe (11,12) angeordneten Fullstufe 24), dadurch gekennzeichnet, daß die Füllstufe 24) als Zentrifugalstufe ausgebildet ist.(11, 12) and with a full stage 24) arranged between the turbomolecular pump stage (6, 7) and the thread pump stage (11, 12), characterized in that the filling stage 24) is designed as a centrifugal stage.
2. Reibungsvakuumpumpe (1) nach Anspruch 1, dadurch gekennzeichnet, daß die Zentrifugalstufe (24) sich im wesentlichen radial erstreckende Stege (25) umfaßt, die peripher offene Taschen (26) bilden und die sich in Höhe des saugseitigen Bereichs der Gewindepumpenstufe (11,12) befinden.2. Friction vacuum pump (1) according to claim 1, characterized in that the centrifugal stage (24) comprises essentially radially extending webs (25) which form peripherally open pockets (26) and which are level with the suction-side area of the threaded pump stage (11 , 12).
3. Reibungsvakuumpumpe (1) nach Anspruch 2 dadurch gekennzeichnet , daß sich die Stege (25) der Füllstufe an die druckseitig letzte Rotorschaufelreihe anschließen und daß die radiale Erstreckung der Stege (25) der aktiven Länge der Schaufeln dieser letzten Rotorschaufelreihe entsprechen.3. Friction vacuum pump (1) according to claim 2, characterized in that the webs (25) of the filling stage connect to the last rotor blade row on the pressure side and that the radial extension of the bars (25) correspond to the active length of the blades of this last rotor blade row.
4. Reibungspumpe (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Tiefe der sich zwischen den Stegen (25) befindlichen Taschen (26) mit steigendem Radius zunimmt.4. Friction pump (1) according to one of claims 1 to 3, characterized in that the depth of the pockets (26) located between the webs (25) increases with increasing radius.
5. Reibungspumpe (1) nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die sich im wesen- tichen radial erstreckenden Stege (25) in Bezug auf die Drehrichtung des rotierenden Systems (7,12) nach hinten geneigt sind.5. Friction pump (1) according to one of claims 2 to 4, characterized in that the essentially radially extending webs (25) are inclined to the rear with respect to the direction of rotation of the rotating system (7, 12).
6. Reibungspumpe (1) nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die sich im wesentlichen radial erstreckenden Stege (25) in Bezug auf die Drehrichtung des rotierenden Systems6. Friction pump (1) according to one of claims 2 to 4, characterized in that the essentially radially extending webs (25) with respect to the direction of rotation of the rotating system
(7,12) nach vorne geneigt sind.(7,12) are inclined forward.
7. Reibungspumpe (1) nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Rotor (12) der Gewindepumpenstufe (11,12) Scheiben- oder glockenförmig ausgebildet ist und daß die Füllstufe (24) Bestandteil des Rotors (12) ist.7. Friction pump (1) according to one of claims 2 to 6, characterized in that the rotor (12) of the threaded pump stage (11, 12) is disc-shaped or bell-shaped and that the filling stage (24) is part of the rotor (12) .
8. Reibungspumpe (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Statoren (6,11) unabhängig von ihren Rotoren (7,12) demontierbar sind.8. Friction pump (1) according to one of the preceding claims, characterized in that the stators (6, 11) can be removed independently of their rotors (7, 12).
9. Reibungspumpe (1) nach Anspruch 8, dadurch gekennzeichnet, daß die Statoren (6,11) aus von einem Gehäuse (6) umfaßten Bauteilen (8,9,15) bestehen.9. A friction pump (1) according to claim 8, characterized in that the stators (6, 11) consist of components (8, 9, 15) enclosed by a housing (6).
10. Reibungspumpe (1) nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Stator (11) der Gewindepumpenstufe (11,12) als separate Hülse (15) ausgebildet ist. 10. Friction pump (1) according to claim 8 or 9, characterized in that the stator (11) of the threaded pump stage (11, 12) is designed as a separate sleeve (15).
EP98954252A 1997-09-24 1998-09-04 Compound pump Expired - Lifetime EP1017944B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29717079U 1997-09-24
DE29717079U DE29717079U1 (en) 1997-09-24 1997-09-24 Compound pump
PCT/EP1998/005611 WO1999015793A1 (en) 1997-09-24 1998-09-04 Compound pump

Publications (2)

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EP1017944A1 true EP1017944A1 (en) 2000-07-12
EP1017944B1 EP1017944B1 (en) 2003-06-25

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EP98954252A Expired - Lifetime EP1017944B1 (en) 1997-09-24 1998-09-04 Compound pump

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US (1) US6422829B1 (en)
EP (1) EP1017944B1 (en)
JP (1) JP2001517757A (en)
DE (2) DE29717079U1 (en)
WO (1) WO1999015793A1 (en)

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Also Published As

Publication number Publication date
US6422829B1 (en) 2002-07-23
WO1999015793A1 (en) 1999-04-01
JP2001517757A (en) 2001-10-09
DE29717079U1 (en) 1997-11-06
EP1017944B1 (en) 2003-06-25
DE59808840D1 (en) 2003-07-31

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